is speaking before the conference. >>> and when president obama took office four years ago, of course, what was the mood? well, the inauguration, it was jubilant, but going into a second term he's facing a much harder road. atlanta's mayor is joining us to talk about those challenges. >>> i think the main mission of what we're trying to dos in our lab, drag psychology kicking and screaming into the 21st century. >> a wimped of the virtual world. >> we're sort of like the unique alliance of hollywood, the military and academia. >> also a chief combatant in u.s. military's battle against post-traumatic stress disorder. ptsd. >> it's not unique to combat, but for veterans what it's become one of the signature woods of iraq and afghanistan. >> skip rizzo. he first graped headlines back in 2006 with his virtual reality ptsd therapy for vets. today he's getting in front of the problem with strive. my colleague chris lawrence got a first look. >> i want to prepare people to deal with stress better. if that doesn't work out, help them fight through the challenges in the aftermath of stress. >> hi.